I've got the Orion unit myself, simply the BEST training aid you can buy for $150! You can tell if the adjustments you made to your car made you faster or slower with the LCS. I believe the Orion version differs from the Alex version in two ways... The Orion has newer and updated software and the available color is purple while the Alex had a bunch of different colors.
I bought mine at SpeedWorld
http://www.speedworldraceway.com/
SpeedTech has them too:
http://www.speedtechrc.com/
John